Portable telephone



FIG. 1 is a front, top, and right side perspective view showing my new design for a portable telephone in an opened position;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a front, top, and right side perspective view thereof in a closed position. 

The ornamental design for a portable telephone, as shown and described. 